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Old 11-05-2010, 02:53 AM   #1
PlasticCarsRock
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Default Dual intake cam mod--worth it?

I have a '95 SL2 automatic with short ram intake, 2.25" stainless mandrel bent exhaust, '92 OE header, WBO2, SAFCII. I'm contemplating the dual intake cam mod (where you replace the exhaust cam with an intake cam, rotated 180 degrees). I couldn't find much by searching--what are the pros and cons? I don't want to sacrifice low-end power so I think all aftermarket cams are out of the picture--how much do the dual intake cams hurt the low end, if at all? How much of a gain can I expect, and where in the power band? Any idle quality issues? Other issues?

Thanks for your input!

...
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Old 11-05-2010, 04:54 AM   #2
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Default Re: Dual intake cam mod--worth it?

Idle feels/sounds the same. Low end power feels lower. Kicks in like Red Bull at ~4.3k rpm's though. MPG seems to be higher too but I'm not sure the mod did it. You'll get more out of it then me with that SAFC II setup.

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Old 11-05-2010, 06:33 AM   #3
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Default Re: Dual intake cam mod--worth it?

Quote:
Originally Posted by fetchitfido View Post
Idle feels/sounds the same. Low end power feels lower. Kicks in like Red Bull at ~4.3k rpm's though. MPG seems to be higher too but I'm not sure the mod did it. You'll get more out of it then me with that SAFC II setup.
Thanks!

Is there a write-up somewhere on how to replace the cam? A search turned up nothing other than advice that it should be done with the engine out of the car... why? Does the sprocket need to be rotated, or can the new cam be installed rotated, with the sprocket still in place, in the original position? The FSM is pretty clear on everything (except rotating the sprocket, if that's necessary)...

...
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Old 11-05-2010, 08:46 AM   #4
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Default

Quote:
Originally Posted by PlasticCarsRock View Post
Thanks!

Is there a write-up somewhere on how to replace the cam? A search turned up nothing other than advice that it should be done with the engine out of the car... why? Does the sprocket need to be rotated, or can the new cam be installed rotated, with the sprocket still in place, in the original position? The FSM is pretty clear on everything (except rotating the sprocket, if that's necessary)...
I believe there is a writeup with photos on sixthsphere.

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Old 11-05-2010, 09:14 AM   #5
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Default Re: Dual intake cam mod--worth it?

+1 on sixthsphere.
I think they added to it recently that if your careful it won't unbalance the cam enough to hurt anything by grinding the offending ring off the cam instead of grinding a tab off the head. That's why they say to do it with the head off...don't want metal shavings getting into the works.

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Old 11-05-2010, 11:10 AM   #6
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Default Re: Dual intake cam mod--worth it?

Quote:
Originally Posted by fetchitfido View Post
+1 on sixthsphere.
I think they added to it recently that if your careful it won't unbalance the cam enough to hurt anything by grinding the offending ring off the cam instead of grinding a tab off the head. That's why they say to do it with the head off...don't want metal shavings getting into the works.
Ahh... so there's something that must be ground. I didn't realize that. I'll search more, over there. (I already searched a bit on 6s before posting, but the search feature isn't all that great. I'm sure I can find it eventually.)

...
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Old 11-05-2010, 01:25 PM   #7
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Default Re: Dual intake cam mod--worth it?

yeah ring needs to be ground off the cam, balance shouldnt be too much of an issue since the cam's only spin at half the speed as the crank.

...
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Old 11-05-2010, 01:57 PM   #8
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Default Re: Dual intake cam mod--worth it?

from my understanding the later heads (00-02 maybe) don't need grinding etc like the earlier one as the tab isn't there.

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Old 11-05-2010, 01:59 PM   #9
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Default Re: Dual intake cam mod--worth it?

Quote:
Originally Posted by saturnsl293 View Post
from my understanding the later heads (00-02 maybe) don't need grinding etc like the earlier one as the tab isn't there.
correct, but the op has a 1g in his avatar so I figured he didnt need that tidbit.

...
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Old 11-05-2010, 02:00 PM   #10
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Default Re: Dual intake cam mod--worth it?

Or just pull the head, grind the nub, machine .02" off of the head for higher compression...

I can't wait to get my car up here, Deebs rebuild, plus decking the head and intake cam.

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Old 11-05-2010, 02:04 PM   #11
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Default Re: Dual intake cam mod--worth it?

Quote:
Originally Posted by Leafy View Post
correct, but the op has a 1g in his avatar so I figured he didnt need that tidbit.
true its a 1g but what if a 3g engine was dropped in at some point for whatever reason? also figure if someone with a 3g or has a 3g engine stumbles across this who's considering the same mod they can find out they don't have to grind anything

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Old 11-05-2010, 06:13 PM   #12
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Default Re: Dual intake cam mod--worth it?

You put the cam in a nice big lathe to cut the ring off. If you have an early head with the lump you can cut it off with a air die grinder if you think about what you are doing and cover and properly prep the work space.

Pictures and instructions. http://forums.plastikhosting.net/viewtopic.php?t=1373

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Old 11-06-2010, 02:04 AM   #13
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Default Re: Dual intake cam mod--worth it?

Quote:
Originally Posted by saturnsl293 View Post
true its a 1g but what if a 3g engine was dropped in at some point for whatever reason? also figure if someone with a 3g or has a 3g engine stumbles across this who's considering the same mod they can find out they don't have to grind anything
if someone put at 3g engine in a non 3g car they need to be slapped for their dumbassism.

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Old 11-06-2010, 02:31 AM   #14
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Default Re: Dual intake cam mod--worth it?

Quote:
Originally Posted by Leafy View Post
if someone put at 3g engine in a non 3g car they need to be slapped for their dumbassism.
What's wrong with the 3g engines? It is the original gen1 ('95) engine, though, with 103k miles (decent compression, about one quart/3k miles oil--no signs of any trouble).

How much work is it to remove/reinstall the head, if I wanted to take off .02"? What kind of gains could I expect? If I'm not mistaken, there's also a valve swap (flat-faced '91 to '93 OE) that would increase my compression slightly--would it be worth doing that in addition (while taking slightly less off the head) or instead of cutting the head?

Taking that ring off the cam wouldn't be any trouble--I have easy access to a good lathe. I also have access to a full machine shop (NC, CNC, etc) so cutting the head wouldn't be too hard, if it's worthwhile; what about porting/port-matching, while I'm at it?

...
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Old 11-06-2010, 06:58 AM   #15
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Default Re: Dual intake cam mod--worth it?

From the little I've read:
Can't put the good/cheap '91-/92 header on it.
Intake manifold doesn't flow as well as the older ones, can't put the good ones on it.

Don't have the stuff & paitence to do the port matching myself but every little bit helps and you might as well do everything you can while its apart.

Have to take the timing chain off to get the head off. Have to also take exhaust and intake manifolds off, well the exhaust at least. Don't forget to get new head bolts if you do take it off, they're torque to yeld (1 use only).

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Old 05-12-2011, 10:47 AM   #16
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Default Re: Dual intake cam mod--worth it?

Can the dual intake mod be done on 3rd gen heads ? Can't seem to find the answer.

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Old 05-12-2011, 11:35 AM   #17
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Default Re: Dual intake cam mod--worth it?

A bit less work on 3rd gen DOHC heads. No nub to grind off.

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Old 05-12-2011, 11:48 AM   #18
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Default Re: Dual intake cam mod--worth it?

Ok, so which year cam do I need ?

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Old 05-12-2011, 06:27 PM   #19
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Default Re: Dual intake cam mod--worth it?

Quote:
Originally Posted by Jess Lookin View Post
Ok, so which year cam do I need ?
'99-'02 (9 bolt exhaust head)

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Old 05-14-2011, 10:05 AM   #20
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Default Re: Dual intake cam mod--worth it?

I guess I should have figured that one out myself, fairly obvious. Thanks Purdue !

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